a sleezy hack to avoid clearing bss on 386.  horrid.

Reference: /n/atom/patch/applied/fsclearbss
Date: Wed Apr 16 04:57:01 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/port/main.c	Wed Apr 16 04:56:42 2014
+++ /sys/src/fs/port/main.c	Wed Apr 16 04:56:43 2014
@@ -61,7 +61,9 @@
 {
 	int i;
 
-	memset(edata, 0, end - edata);
+	/* BOTCH ... fix pc port so this is ok */
+	if(sizeof(uintptr) == 8)
+		memset(edata, 0, end - edata);
 	echo = 1;
 	predawn = 1;
 		lockinit();